What version of WFA are you using? Are you using an account that is assigned the admin role? The is a known issue with older WFA versions where downloading exports fails. The workaround is to browse to the download directory. IE
Worst case you could install WFA on another server and import the exported workflow .dar files. Do you have a support case open? If so whats the case number? Regardless if you have created custom workflows i would expect that the backup and restore features of WFA are supported.
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I see what you mean, i've replicated the issue in my lab using WFA 4.1 GA. The problem is that if you attempt to create a backup using the REST API:
Or if you use wfa.cmd or backup.ps1 it results in a HTTP 404 error.
PS C:\> cd '.\Program Files\NetApp\WFA\bin'
PS C:\Program Files\NetApp\WFA\bin> .\Backup.ps1 -User backup -Password ************ -Path C:\Temp\backup.zip
Exception calling "GetResponse" with "0" argument(s): "The remote server returned an error: (404) Not Found."
The backup is actually created, the issue is actually downloading the backup.
The workaround is to browse to "<%wfa_install%>jboss\standalone\deployments\download.war" and copy the file: